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(mob-2-43-182-132.net.vodafone.it. [2.43.182.132]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-57a35e86c36sm197223a12.54.2024.05.30.16.27.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 May 2024 16:27:58 -0700 (PDT) From: technoboy85@gmail.com To: netdev@vger.kernel.org Cc: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Shuah Khan , Shakeel Butt , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Matteo Croce Subject: [PATCH net-next v2 2/2] selftests: net: tests net.core.{r,w}mem_{default,max} sysctls in a netns Date: Fri, 31 May 2024 01:27:22 +0200 Message-ID: <20240530232722.45255-3-technoboy85@gmail.com> X-Mailer: git-send-email 2.45.1 In-Reply-To: <20240530232722.45255-1-technoboy85@gmail.com> References: <20240530232722.45255-1-technoboy85@gmail.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Matteo Croce Add a selftest which checks that the sysctl is present in a netns, that the value is read from the init one, and that it's readonly. Signed-off-by: Matteo Croce --- tools/testing/selftests/net/Makefile | 1 + tools/testing/selftests/net/netns-sysctl.sh | 40 +++++++++++++++++++++ 2 files changed, 41 insertions(+) create mode 100755 tools/testing/selftests/net/netns-sysctl.sh diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile index bd01e4a0be2c..6da63d1831c1 100644 --- a/tools/testing/selftests/net/Makefile +++ b/tools/testing/selftests/net/Makefile @@ -53,6 +53,7 @@ TEST_PROGS += bind_bhash.sh TEST_PROGS += ip_local_port_range.sh TEST_PROGS += rps_default_mask.sh TEST_PROGS += big_tcp.sh +TEST_PROGS += netns-sysctl.sh TEST_PROGS_EXTENDED := toeplitz_client.sh toeplitz.sh TEST_GEN_FILES = socket nettest TEST_GEN_FILES += psock_fanout psock_tpacket msg_zerocopy reuseport_addr_any diff --git a/tools/testing/selftests/net/netns-sysctl.sh b/tools/testing/selftests/net/netns-sysctl.sh new file mode 100755 index 000000000000..45c34a3b9aae --- /dev/null +++ b/tools/testing/selftests/net/netns-sysctl.sh @@ -0,0 +1,40 @@ +#!/bin/bash -e +# SPDX-License-Identifier: GPL-2.0 +# +# This test checks that the network buffer sysctls are present +# in a network namespaces, and that they are readonly. + +source lib.sh + +cleanup() { + cleanup_ns $test_ns +} + +trap cleanup EXIT + +fail() { + echo "ERROR: $*" >&2 + exit 1 +} + +setup_ns test_ns + +for sc in {r,w}mem_{default,max}; do + # check that this is writable in a netns + [ -w "/proc/sys/net/core/$sc" ] || + fail "$sc isn't writable in the init netns!" + + # change the value in the host netns + sysctl -qw "net.core.$sc=300000" || + fail "Can't write $sc in init netns!" + + # check that the value is read from the init netns + [ "$(ip netns exec $test_ns sysctl -n "net.core.$sc")" -eq 300000 ] || + fail "Value for $sc mismatch!" + + # check that this isn't writable in a netns + ip netns exec $test_ns [ -w "/proc/sys/net/core/$sc" ] && + fail "$sc is writable in a netns!" +done + +echo 'Test passed OK'